Speed and Feed Charts - Ballnose Roughers
Speed & Feed Charts for Ballnose Roughers
Medium Steel: 1018, 1020, 4140, 4150, P-20
1" / 25mm 1" / 32mm 1" / 40mm 2" / 50mm    
RPMs
 1600-2800 1400-2400 1400-2200 800-1800      
Feed Rate (inches/minute)
30-90 30-100 10-100 40-100      
Depth of Cut
 .070-.200 .100-.250 .150-.300 .150-.400      
Stepover
 .100-.300 .100-.400 .100-.500 .100-.750      
Tool Steel: 2, D2, S7, GM190
1" / 25mm 1" / 32mm 1" / 40mm 2" / 50mm    
RPMs
 1400-2400 1300-2200 1200-2200 800-1600      
Feed Rate (inches/minute)
30-70 30-70 30-60 30-60      
Depth of Cut
 .070-.150 .400-.220 .150-.250 .150-.300      
Stepover
 .100-.200 .100-.300 .100-.400 .100-.500      
Iron: Cast, Nodular, Ductile
1" / 25mm 1" / 32mm 1" / 40mm 2" / 50mm    
RPMs
 1800-3000 1800-3000 1600-2800 1200-2000      
Feed Rate (inches/minute)
40-100 40-150 40-150 40-150      
Depth of Cut
 .080-.200 .100-.300 .100-.350 .200-.750      
Stepover
 .100-.300 .100-.300 .100-.375 .200-1.00      

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